Pull the low side liner away from the wall, add dirt behind it to move it forward, repeat until your water is level. Or if you have excess liner like said above put dirt under it to raise up the edge. Add extra dirt because newly moved dirt will settle.
Can you post some pictures, that helps us see where the issues are.
Agree with everyone. As long as you have enough liner on the low side, just build up the soil, then raise your water level.
Or...you can do the opposite. Dig out the soil under the side where the liner is exposed. But keep in mind that you don't want your pond lower than the surrounding area. You don't want fertilizers or debris from hard rains washing into the pond.
@Trep Wow you have lots of liner left, that's good! Another thing you could do, which would be more work would be to add a short shelf all around your pond and put medium sized rocks on that shelf and the top the pond edge w/more rocks that over lap the bottom rocks. That way you won't see the liner.
You have lots of liner to play with. Heck, you can expand the edges out creating planting shelves where you can place nutrient consuming plants. Plants are an important part of the pond ecosystem. They starve the algae of nutrients.
Then create a stone shelf like j.w suggested. And in the end, your pond will be bigger.
You left yourself lots of liner to work with - that's a plus! Like others have said - raise the lower side. You'll get more depth, and you'll stop any potential runoff getting into the pond. Adding shelves is an easy fix (she says from her comfy chair with a cup of coffee in one hand!) Ask questions if you're stuck and we'll keep sipping and advising!
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